Cirrus-logic CRD44800 Manuel d'utilisateur

1Copyright Cirrus Logic, Inc. 2004(All Rights Reserved)Cirrus Logic, Inc.www.cirrus.comCRD4480050 W Half-Bridge Reference Design for the CS44800Feat

CRD4480010System Issues2.1 Power Supply RatingsThe required power supply current rating can be estimated as follows. 33 W is used as thereference outp

CRD44800112.3 Electromagnetic Interference (EMI)The EMI challenges that face a maker of Class-D amplifiers are largely the same challengesthat have be

CRD4480012than about 25 mm.It is extremely critical that the layout of the power amplifier section of the Cirrus LogicCS44800 Reference Design be copi

CRD44800133. SCHEMATICS Figure 4. Power and Connectors

CRD4480014Figure 5. CS44800

CRD4480015 Figure 6. Left/Right Back Surround Channels

CRD4480016Figure 7. Left/Right Surround Channels

CRD4480017 Figure 8. LFE/Center Channels

CRD4480018 Figure 9. Left/Right Channels

CRD4480019Figure 10. PSR Feedback

CRD448002TABLE OF CONTENTS1. SCHEMATIC DESCRIPTIONS ...

CRD44800204. LAYOUTFigure 11. Silk Screen Top

CRD4480021Figure 12. Topside Layer

CRD4480022Figure 13. Bottomside Layer

CRD44800235. BILL OF MATERIALS Line ItemRev Description Qty U/M Reference Designator MFG MFG. P/N1 A CAP 1000pF ±10% 50V X7R 0603 2 EA C145 C

CRD4480024Line ItemRev Description Qty U/M Reference Designator MFG MFG. P/N21 A IND, 22UH, 3.5A 8 EA L5 L6 L7 L8 L9 L10 L11 L12 TRANSTEK MAGNETIC

CRD44800256. TYPICAL PERFORMANCE PLOTS -5+1-4.5-4-3.5-3-2.5-2-1.5-1-0.5-0+0.5dBr A20 20k50 100 200 500 1k 2k 5k 10kHzFigure 16. Frequency

CRD44800260.00110.0020.0050.010.020.050.10.20.5%20 20k50 100 200 500 1k 2k 5k 10kHz1 W10 W20 WFigure 17. THD+N vs. Frequency at 1 W, 10 W, and 20 W

CRD44800270.01100.020.050.10.20.5125%100m 50200m 500m 1 2 5 10 20WFigure 18. THD+N vs. Power at 1 kHz

CRD4480028-140+0-130-120-110-100-90-80-70-60-50-40-30-20-10dBr A20 20k50 100 200 500 1k 2k 5k 10kHzFigure 19. FFT at -60 dBFS and 1 kHz

CRD44800297. REVISION HISTORY Release Date ChangesRD1 June 2004 1st ReleaseRD2 December 2004 2nd Release-Updated schematics and layout to reflec

CRD4480031. SCHEMATIC DESCRIPTIONS 1.1 CRD44800 PWM AmplifierThe CS44800 shown in Figure 5 employs a built-in Sample Rate Converter (SRC) to supportal

CRD448004In the Remote mode, the DB-9 connector (J14, labelled RS-232) is connected to a host PC.All aspects of the CS44800 may then be evaluated usin

CRD4480052. OPERATION INFORMATIONSwitches and Indicators (Located on the Driver Board):RESET Pushbutton (S1) - forces a complete system reset.MUTE Pus

CRD4480065) Supply either analog signals (if the Analog input option is selected) or either coaxial or opticaldigital PCM inputs (if the digital S/PDI

CRD448007input source by pressing the Mute button. The following table shows the inputs selections: 4) Connect the DB-9 RS-232 port (J14) on the CRD4

CRD448008 The Advanced Register Debug tab provides low level control over the CS44800 and CS8416 in-dividual register settings. Each device is disp

CRD448009Figure 3. Advanced Register Debug Tab - CS44800